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Report on Determining the Reactivity of Concrete Aggregates and Selecting Appropriate Measures for Preventing Deleterious Expansion in New Concrete Construction

Table of Contents


This document is disseminated under the sponsorship of the U.S. Department of Transportation in the interest of information exchange. The U.S. Government assumes no liability for the use of information contained in this document.

This report does not constitute a standard, specification, or regulation.

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Technical Report Documentation Page

1. Report No.

2. Government Accession No.

3. Recipient’s Catalog No.

4. Title and Subtitle
Report on Determining the Reactivity of Concrete Aggregates and Selecting Appropriate Measures for Preventing Deleterious Expansion in New Concrete Construction

5. Report Date
April 2008

6. Performing Organization Code

Michael D.A. Thomas, Benoit Fournier, and Kevin J. Folliard

8. Performing Organization Report No.

9. Performing Organization Name and Address
The Transtee Group, Inc.
6111 Balcones Drive
Austin, TX 78731

10. Work Unit No. (TRAIS)

11. Contract or Grant No.

12. Sponsoring Agency Name and Address
Office of Pavement Technology
Federal Highway Administration
1200 New Jersey Avenue, SE
Washington, DC 20590

13. Type of Report and Period Covered
Final Report April 2008

14. Sponsoring Agency Code

15. Supplementary Notes
Contracting Officer’s Technical Representative (COTR): Gina Ahlstrom, HIPT-20

16. Abstract
Alkali-aggregate reactions (AAR) occur between the alkali hydroxides in the pore solution of concrete and certain minerals found in some aggregates. Two types of AAR reaction are currently recognized depending on the nature of the reactive mineral; alkali-silica reaction (ASR) involves various types of reactive silica (SiO2) minerals and alkali-carbonate reaction (ACR) involves certain types of dolomitic rocks (CaMg(CO3)2). Both types of reaction can result in expansion and cracking of concrete elements, leading to a reduction in the service life of concrete structures.

This report describes approaches for identifying deleteriously reactive aggregates and selecting appropriate preventive measures to minimize the risk of expansion when such aggregates are used in concrete. Preventive measures include avoiding the reactive aggregate, limiting the alkali content of the concrete, using supplementary cementing materials, using lithium-based admixtures, or a combination of these strategies.

17. Key Word
Alkali-silica reaction, Alkali-aggregate reaction, reactive aggregates, concrete durability, prevention, fresh concrete, laboratory testing, supplementary cementing materials, lithium

18. Distribution Statement
    No restrictions. This document is available to the public through the National Technical Information Service; Springfield, VA 22161.

19. Security Classif. (of this report)

20. Security Classif. (of this page)

21. No. of Pages

22. Price

Form DOT F 1700.7 (8-72) Reproduction of completed page authorized.
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Updated: 06/13/2012